The following table shows the average rainfall in 150 towns. Show the information by a frequency polygon.

Average rainfall (cm)

0 - 20 20 - 40 40 - 60 60 - 80 80 - 100

No. of towns 14 12 36 48 40

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Solution

Consider the following table

Class
(Average rainfall in cm) Class Mark Frequency
(Number of towns)

0 - 20 10 14

20 - 40 30 12

40 - 60 50 36

60 - 80 70 48

80 - 100 90 40

The frequency polygon using the class mark and frequancy given in the above table as

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Similar questions

Marks	10−20	20−30	30−40	40−50	50−60	60−70	70−80	80−90
No. of students	7	13	20	25	10	8	6	1

Price (Rupees)	20 less than	20 - 40	40 - 60	60 - 80	80 - 100
No. of articles	140	100	80	60	20

Compute the mode of the following data: [CBSE 2013]

Class	0−20	20−40	40−60	60−80	80−100
Frequency	25	16	28	20	5

Class	0-20	20-40	40-60	60-80	80-100	100-120
Frequency	7	f₁	12	f₂	8	5

Age (in Years)	0-10	10-20	20-30	30-60	60-90
No. of people	50	90	200	120	40

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Average rainfall (cm)	0 - 20	20 - 40	40 - 60	60 - 80	80 - 100
No. of towns	14	12	36	48	40